Electro-magnetic clutch



(No Model.) 2 Sheets-Sheet 1.

e. E. KBLLeJr. ELECTRO MAGNETIC CLUTCH.

No. 443,772. Patented Dec. 30,'1890.

@M www 1 (No Model.) ZSheets-Sheet 2.

O. E. KELLS, Jr.

ELECTRO MAGNETIC CLUTCH.

No. 443,772. Patented Deo. 30, 11890.

NNIIIIIUII! man III u A y ha mw.,

n Puma-kmo., msumevan u l CHARLES EDMUND KELLS, .I R., OF N I ORLEANS, LOUISIANA.

`ELECTROHWIAGNE'IC CLUTCH.

SPECIFICATION forming part of Letters Patent No. 443,772, dated December 30,1890.

Application tiled March Si, 1890.

T0 @ZZ whom it may concern.-

Be it known that I, CHARLES EDMUND KELLS, Jr., a citizen of vthe United States, residing at New Orleans, in the parish of Orleans and State of Louisiana, have invented certain new and useful Improvements in Electro-litiagnetic Friction Brakes or Clutches, of which the following is a specification.

The object of my invention is to provide electro-magnetic devices for instantly stopping machinery conn ect-ed with a power-shaft.

My invention while involving certain improved organizations of instrumentalities is not contined to the details of construction hereinafter described.

The accompanying drawings show several ways of embodying my invention.

Figure l is a vertical longitudinal section through the clutch mechanism, the powershaft being in elevation. Fig. 2 is a similar view showinga modification. Fig. 3 is a similar View showing a further modification, and Fig. 4 is a plan view of still another modification.

Referring iirst to Fig. l of the drawings, the main or power shaft A may be mounted and driven in any suitable way. I have shown my improved clutch mechanism motilited on one end of the shaft. The shaft A extends through abracket B, which is provided with an arm C, t0 which is attached the electro-magnet E, which may be of any suitable construction. It is shown as consisting of a coil e arranged within a tubular metallic casing e', through which the shaft A extends. The end e2 of this casing constitutes one pole of the magnet. The armature F is secured to one end of a sleeve G, which eX- tends through the tubular m'agnet and is free to slide on the shaft A. The gear-wheel or pulley II, which communica-tes power from the shaft A to the machinery, is secured to the end of the sleeve opposite that which carries the armature F. l A friction-block I is secured to the casing of the magnet, and, as shown, is formed with an inclined or tapered friction-surface e', which may engage with a correspondingly-shaped flange h of the pulley H. A friction-collar J is rigidly secured to the main shaft A on the opposite side of the pulley H. This collar is provided with a friction-surface j adapted to engage with the Serial No. 346,073. (No model.)

the wheel H; but when the magnet E is energized the armature F will be attracted, and will thus move the wheel I-I away from the friction-block I against the force of the sprin K into engagement with the friction-collar J, and the wheel will be revolved with the shaft. As soon as the electric circuit is broken the electro-magnet E is demagnetized and the spring K will force the wheel I-I out of engagement with the friction-collar .I and into engagement with the stationary block Lthus instantly stopping the wheel and the machinery connected therewith.

In Fig. 2 I have shown a tubular magnet E similar in construction to that just described and rigidly secured to a bracket B, in which the power-shaft A has a bearing. An arm C, in this instance shown as secured to the casing of the magnet, extends over the Wheel or pulley H, and on the end of this arm is journaled a friction-wheel I', which is held against rotation by a piu I2, extending through the arm C. The wheel or pulley H is in this instance shown as formed of magnetizable material and is interposed between the friction-wheel I and the magnet E. The inner end H of the hub of the wheel H is formed with a tongue h2, adapted to engage with a recess in afriction-block L keyed tothe shaft A. Normally the wheel is held by a spring K out of engagement with the friction-blockL and in engagement with the friction-wheel I. When the magnet is energized, the pulley is drawn toward the magnet and the tongue h2 engages with the recess b3. The wheel I-I is thus caused to revolve .with the powershaft. As soon as the magnet is tie-energized the pulley II assumes the position shown in the drawings and instantly ceases to rotate. A friction-collar L is interposed between the block L and the bracket B to take up wear and receive the thrust ofthe wheel II on the block L.

In Fig. 3 the tubular magnet E is secured to an arm C, attached to a bracket B, through IOO which the shaft A extends, and a clutch-block l2 is rigidly secured to the shaft. rlhe wheel. or pulley ll is interposed between the clutehblock and the magnet and is normally held in engagement with the clutch-block by a spring K,whieh bears at one end against a collar 7.1 fast on the shaft A. Then the magnet is energized, the pulley Il is disengaged from the power-shaft and drawn against the end of the magnet, which acts as a ,brake to instantly stop the revolution of the wheel.

A slight modification is shown in Fig. ai. In this instance a U -shaped or double electromagnct E is secured to a bracket B, through which the shaft A extends. The wheel o1' pulley 1I is normally held by a spring' K in engagement wit-h an ordinary toothed clutchblock K2, tast on the sha-ft A. XVhen the mag net is energized, the pulley Il is withdrawn from the clutch-block K2 and ceases to rotate, being held in engagement with the pole-pieces of the magnet.

I have shown several ways of embodying my invention, but other ways might be suggested. Obviously the details of construetion might be changed without departing from the novel features of my invention.

I elaim as my inventionn l. The combination, substantially as hereinbefore set forth, of a power-driven shaft, a wheel or pulley loosely mounted thereon, an electrounagnet, its armature, connections between the armature and the wheel, a spring for holding the armature away from the inagnet, a friction-block with which the wheel engages when the armature is withdrawn from the magnet, and a friction-collar with which the wheel engages when the magnet attracts its armature.

2. The combination, substantially as hereinbefore set forth, of the power-driven shaft, a gear-wheel mounted thereon, a friction-eollar rigidly secured to the shaft and adapted to engage with the wheel, a stationary friction-hlock also adapted to engage with the wheel, and electro-magnetic devices for causing the wheel to engage with either the stationary block or the friction-collar.

3. The combination, substantially as hereinbefore set forth, of a power-driven shaft, a wheel or pulley mounted thereon, a tubular magnet through which the shaft extends, its armature, a sleeve extending through the magnet and connecting the wheel with the armature, a stationary friction-block, a f riction-eot lar secured to the shaft, and a spring for holding the wheel in engagement with the stationary friction-block when the magnet is deenergized.

In testimony whereof I have hereunto subscribed my name.

CHARLES EDMUN D KELLS, JR.

XVit-nesses:

F. J. ALEIX, (Inns. MATN. 

